I have a somewhat basic question about mechanisms, I watch videos and read, but they do not give me the answer I am looking for, they only focus on clearing the formula to know the RPM of the last pulley.
I know that if two pulleys are fitted and the drive pulley is smaller in diameter than the take-up pulley then the take-up pulley will have higher torque and lower RPM compared to the drive pulley. If it is twice the size, then in theory it will have twice the strength.
My question is regarding the attached image. Imagine that pulley 4 has the same diameter as pulley 2, and pulley 2 has a transmission ratio of 2: 1 (twice the size, twice the torque, less speed) relative to that of the driving pulley (the 1), so ... will pulley 4 have 4: 1 torque, or am I wrong?
Because if you don't have a higher torque, why are you using multiple pulleys instead of just one with a bigger belt?
Regards.